Installation and application. Leakage detectors, CLS/FLS/FLS10/MiniCAS II

Transcription

1 Installation and application Leakage detectors, CLS/FLS/FLS/MiniCAS II

2 INTRODUCTION A number of condition monitoring sensors are available for the ITT FLYGT pump range. Thermal switches for stator over temperature. CLS for water in oil detection. FLS for the detection of liquid in the stator housing. FLS for detection of liquid in the inspection chamber in the new midrange pump series, i.e. 3153, 3171, 30 and Any combination of these sensors can be used with the standard versions of the pumps. Explosion proof approved pumps are restricted to the use of the with or without FLS and FLS only. The sensors are monitored by the ITT FLYGT MiniCAS II supervision relay, which is situated in the panel. BASIC SENSOR CONNECTIONS (5 alternative sensor combinations) POWER SUPPLY 4 V AC/DC, V AC and 30 V AC (-) 330 1, k FLS FLS + thermal sw. 0 ma = Overtemperature 7,8 ma = OK 3 ma = Leakage (1) RESET , 770k FLS FLS + thermal sw. 0 ma = Overtemperature ma = OK 8 ma = Leakage () SENSOR OUTPUT HIGH TEMP CLS CLS + thermal sw. 0 ma = Overtemperature 5,5 ma = OK 9 ma = Leakage (5s delay) (3) 11 9 S Values of operation I < 3 ma = Overtemp 3 < I < ma = OK I > ma = Leakage Circuits shown de-energised 8 1 kohm 330 1, k Thermal sw. + FLS + CLS 0 ma = Overtemperature 13,3 ma = OK 3-4 ma = Leakage (0/5s delay) Thermal sw. + 1 kohm resistor 0 ma = Overtemperature 1 ma = OK (4) (5) Note! 4 V AC/DC, RESET also possible by connecting terminals -. NOTES 1. Amber LED indicates supply on. Overtemperature relay energised when healthy. Leakage relay de-energised when healthy. Red overtemperature LED off when healthy. Red leakage LED off when healthy.. MiniCAS II resets automatically after leakage fault. MiniCAS II requires resetting after overtemperature fault. Please see Technical Data. 3. There is not a separate indication when two leakage sensors are used.

3 INSTALLATION The monitoring connections at the panel The MiniCAS II supervision relay is installed in the pump panel and simply plugs into an eleven pin relay base. Six basic sensor connections are possible. 1. Thermal switches with FLS The pilot cores in the pump can be connected to the panel in either polarity.. Thermal switches with FLS The pilot cores in the pump can be connected to the panel in either polarity. 3. Thermal switches with CLS The CLS sensor is diode protected. For this reason the pilot cores are required to be connected with the correct polarity (brown = +, black = ). Connected incorrectly the MiniCAS II supervision relay will indicate an open circuit (0 ma), i.e. with the amber supply LED and the red overtemperature LED both on. Connected correctly and reset, the amber LED only will be on. 4. Thermal switches with CLS + FLS The pilot cores in the pump cable are required to be connected with the correct polarity (brown = +, black = ), however, because the FLS will cause the MiniCAS II to indicate healthy, i.e. amber LED ON, even when incorrectly connected CLS, a current reading of the monitoring circuit must be taken when installing the pump. Correct polarity will indicate 15.0 ma; incorrect polarity will indicate 7.8 ma with healthy conditions. 5. Thermal switches only A ohm resistor must be connected in series with the thermal overtemperature switches. A 00 ohm resistor is enclosed in the package. MiniCAS II supervision relay 11 pin relay base Top Width 33 mm Height 79 mm Depth 75 mm 79mm MINI Control And Status II EN A A TEMPERATURE 75mm SUPPLY Part-nos: (4 V AC/DC) ( V AC) mm (30 V AC) Part-no:

4 Variable frequency inverter controlled pumps/mixers In installations utilizing variable frequency inverters for speed control of pumps, interference from a variable frequency drive (VFD) may cause nuisance tripping of monitoring equipment and the electronic sensor CLS. VFD-interference does not affect FLS and FLS. Interference occurs when the pilot cores are in close proximity to the power cores. The interference may be suppressed by connecting a suitable filter 1 between the monitoring conductors (T1, T) and ground (PE). The filter should ideally be situated in the pump/mixer junction box. Cables containing both power and pilot cores should be kept to a minimum length. The power cable and control cable should be run in separate cable ducts with a distance of at least 300 mm between them. Our pumps are CE-marked according to EMC-directive and the VFD that we buy from a subcontractor should also be CE-marked. In order to make the VFD pass the EMC-tests the interconnecting cable between pump and VFD has to be screened. 1 Available filter kits: Part no Will fit: 3, 317, Part no Will fit: 3085, 44. Part no Will fit: 3140, 315, 3170, 301, Part no Will fit: 331, 330, 331, 3351, 335, 3400, 3501, 30, 3800, 7045, 701, 7081, 71, 7115, 711. Part no. 00 Will fit: 430, 440, 450, 40. Part no. 01 Will fit: 470,

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6 Checking the sensor circuit and fault finding Connect a multimeter in series with the sensors or use the ITT Flygt sensor tester ST-1 (FD part no ) to measure the current in the sensor circuit. See figures below. ST-1 is not yet prepared to handle the new sensor FLS. The figures on page is used as reference to determine the status of the sensors (sensor connections). Circuits with CLS require some extra consideration. Connected with wrong polarity the CLS draws a zero current. The CLS can then be considered not connected. Wrong polarity results in 0 ma for circuit (3). Circuit (4) is reduced to the same as circuit (1). As opposed to the FLS and FLS, the CLS has a built-in alarm delay of 5 seconds. Since the has only one leakage indication lamp, an alarm from the CLS or the FLS looks the same. For circuit (4), this means that a leakage alarm can not be attributed to either of the two sensors just by looking at the. To make out the tripping sensor without lifting the pump, a measurement of the sensor current is necessary. Sensor current measurement using a multimeter POWER SUPPLY 4 V AC/DC, V AC and 30 V AC (-) Note! 4 V AC/DC, RESET also possible by connecting terminals -. RESET SENSOR OUTPUT , k Therm sw. +FLS +CLS 0 ma = Overtemp 13,3 ma = OK 3-4 ma = Leakage(0/5s delay) TEMPERATURE SUPPLY 37 ma Mini CASII Values of operation A ma Com V/W I < 3 ma = Overtemp 3 < I < ma = OK I > ma = Leakage General procedure to check the status of the sensors 1. Close the sensor circuit by connecting the multimeter test leads according to figure above or on next page.. From the moment contact is made, observe the sensor current for at least 5 seconds (to await a possible CLS alarm current). 3. Switch polarity of the sensor leads (5, 7) and repeat steps 1 and. 4. Identify the actual sensor circuit with the help of the first page figure and analyse the sensors status. 5. In case circuit (4) is used: By using the wrong polarity and delay properties of the CLS, it is possible to conclude if a leakage alarm is attributed to the CLS or FLS.. To ensure that the polarity is right after the measurement, restore the connection resulting in the largest current.

7 To be noted A zero current may be the result of a broken sensor lead or an open thermal switch. A leakage alarm may be caused by a short circuit due to pinched sensor leads or a correct leakage signal from FLS, FLS or CLS. Sensor current measurement using ST , k Therm sw. +FLS +CLS 0 ma = Overtemp. 13,3 ma = OK 3-4 ma = Leakage (0/5s delay) 37 ma ST-1 Polarity Checking earth faults Earth faults on the monitoring cores must be checked for and avoided as they may cause spurious seal leakage indications. Fault finding of this nature should only be carried out using a multimeter ohms scale and not an insulation tester utilising 500 V or above as a test voltage. Measure between each sensor lead and earth. Ideally the value should be infinite but Mega ohm values are acceptable. Earth fault measurement O.L MW FLS A ma Com V/W CLS 7

8 Checking the The can be checked by using loose sensors connected to the sensor output or by simulating the sensors using resistors. A simple test can be performed with a resistor, for example the one enclosed in the delivery package (1 kohm): Connect the input, and to the correct voltage, 4V AC/DC, V AC or 30 V AC. Simulating normal condition Connect a resistor of between 1 kohm to 1,5 kohm to the sensor outputs 5 and 7. If a multimeter is available it can be connected in series with the resistor (see fig.) Reset the by shortly connecting and disconnecting a lead between outputs and 7. Now, the SUPPLY lamp only should be lit. RESET 7+ POWER SUPPLY 4 V AC/DC, V AC and 30 V AC SENSOR OUTPUT TEMPERATURE 7+ 5 (-) 1 kohm 1 ma Mini CASII Values of operation I < 3 ma = Overtemp 3 < I < ma = OK I > ma = Leakage SUPPLY A ma Com V/W Note! 4 V AC/DC, RESET also possible by connecting terminals -. The ma reading with a 1 kohm resistor: 1 V / 00 ohm = 1 ma. Simulating temperature alarm If nothing is connected to the sensor outputs 5 and 7 (open circuit), the SUPPLY and TEMPERATURE lamps are both lit. The current is obviously zero ma. Simulating leakage alarm The leakage condition can be checked by connecting a 500 ohm (or less) resistor to the sensor outputs 5 and 7. It is fine to short circuit the output with the multimeter or a jumper. Note that there is a s delay 1 before the lamp is lit. The TEMPERATURE lamp may or may not be lit depending on if the has been reset. RESET POWER SUPPLY 4 V AC/DC, V AC and 30 V AC SENSOR OUTPUT 7+ (-) ma* TEMPERATURE SUPPLY 5- A ma Com V/WW Mini CAS II Values of operation I < 3 ma = Overtemp 3 < I < ma = OK I > ma = Leakage * At short circuit, limits the current to 30 ma Note! 4 V AC/DC, RESET also possible by connecting terminals -. 1 The 4 V AC/DC has been updated at one occasion. Both versions have part no but are easily distinguished by looking at the circuit diagram on the side of the unit. Check the delay of the leakage alarm. The original version has a 5 s delay. The updated version has a s delay. This version also has an improved noise protection. In some cases where noise, generated by a variable frequency drive, has made the original version fail, the new version works. 8

9 MiniCAS II supervision relay TECHNICAL DATA Operational principle: Current Sensing Approvals: CE, C-UR (covering USA and Canada) and CSA Environment: 5 to 0 C (maximum 90% relative humidity) Supply voltage 4 V AC/DC: 0-30 V AC (50-0Hz) V DC Supply voltage V AC: V AC (50-0 Hz) Supply voltage 30 V AC: 30 V AC (50-0 Hz) Relay contact rating: 50 V AC / 5A Voltage to sensor: 1 V DC +/ 5% Values of operation: 3mA < I < ma = OK condition I < 3 ma = High temperature (or interruption) I > ma = Leakage (or short circuit), s delay of alarm ( I = current measured by MiniCAS II ) Power supply required: 5 VA OPERATION Leakage: Changeover contacts 11 8 Normally closed for interlock 11 9 Closes for alarm Automatic reset Red LED for indication follows the relay Red indication lamp on: Leakage Red indication lamp off: No leakage Temperature: Changeover contacts 1 3 Closes for interlock when energized 1 4 Normally closed for alarm Manual reset (see below) Red indication lamp on: Over temperature Red indication lamp off: Normal temperature Reset of Temperature Alarm: External reset is possible either by connecting terminals -7 with an external push button or by interrupting the supply voltage. Note, in the 4 V version, Reset is also possible between -. DIMENSIONS: Width 33 mm Height 79 mm Depth 75 mm PART NOS: (4 V AC/DC) ( V AC) (30 V AC) 9

10 TECHNICAL DATA CONNECTIONS Leakage alarm will stop the pump This installation can be used if the leakage alarm shall stop the pump. It is recommended if the FLS sensor is used. The FLS is detecting liquid in the stator housing, which is critical and requires a quick stop of the pump. T1 SENSORS T CONTROL CIRCUIT RESET * 1 kohm (-) POWER SUPPLY 4V AC/DC, V AC and 30 V AC I (ma) HIGH TEMP 4 3 Cicuits shown de-energised HIGH STATOR TEMP ALARM 8 AUX. RELAY S PUMP CONTACTOR PUMP MAIN SUPPLY Note! 4 V AC/DC, RESET also possible by connecting terminals -. Leakage alarm will not stop the pump (only warning) This installation can be used if the leakage alarm shall not stop the pump but give a warning on the Mini- CASII. It is recommended if FLS in inspection chamber or CLS is used. These sensors detect liquid in the inspection chamber (FLS) and water in the oil (CLS), which is less critical than water in the stator housing. FLS is used in the new midrange pump series, i.e. 3153, 3171, 30 and SENSORS CONTROL CIRCUIT T1 T RESET (-) POWER SUPPLY 4 V AC/DC, V AC and 30 V AC I (ma) * 1 kohm S HIGH TEMP AUX. RELAY Circuits shown de-energised ALARM HIGH STATOR TEMP. PUMP CONTACTOR PUMP MAIN SUPPLY **) Fit resistor to avoid short circuit if only thermal contacts are to be connected.

11 TECHNICAL DATA FLS stator leakage sensor Signal: 8 ma non-alarm current, 3 ma alarm current Supply voltage: Max. duty temperature: 90 C Material: Aluminium Physical size, sensor Length: Width: Height: 7 mm 1 mm 1 mm Part Number FLS inspection chamber sensor Signal: ma non-alarm current, 8 ma alarm current Supply voltage: 1VDC Max. duty temperature: 90 C Material: Stainless steel and nitril rubber Physical size, sensor Length: Diameter: Thread: 44 mm mm M1 1, length 9 mm Part number CLS water in oil sensor Trip emulsion: Signal: Poles: 35% of water in oil 5.5 ma non-alarm current, 9mA alarm current (5 s delay of alarm) wires protected with a diode (wrong polarity connection = 0 ma) Supply voltage: (± %) (brown = +. black = ) Metal parts: Acid proof stainless steel Sensor surface: Glass Max. pressure: MPa 1h Test pressure: 40 MPa Duty pressure: MPa Max. temperature: 90 C, 1h Test temperature: 115 C, 1h Max. duty temperature 70 C Physical size, sensor Length: Diameter: Thread: 75 mm 1 mm M1 1.5, length 15 mm Part number: Warning: Sensor body made of glass. Handle with care. 11

12 What can ITT Water & Wastewater do for you? Integrated solutions for fluid handling are offered by ITT Water & Wastewater as a world leader in transport and treatment of wastewater. We provide a complete range of water, wastewater and drainage pumps, equipment for monitoring and control, units for primary and secondary biological treatment, products for filtration and disinfection, and related services. ITT Water & Wastewater, headquartered in Sweden, operates in some 140 countries across the world, with own plants in Europe, China and North and South America. The company is wholly owned by the ITT Corporation of White Plains, New York, supplier of advanced technology products and services. ITT Water & Wastewater AB Visiting address: tel SE-91 0 Kristianstad Industrigatan 50 Fax Sweden Kristianstad Sweden 8947_1_EN_GB_INST_CLS/FLS/FLS/MiniCAS II.pdf ITT Water & Wastewater AB This document may be changed without any prior notice.